Page created to cleanup specs
Note that if ECU is manufactured to specs, but the specs is wrong, it will not work. Sectrig=HALL (cam), we can agree on that... However, even after several "we are sure emails", primary trigger=HALL is specified which we think is wrong. On single-Vanos M50 engines (also considering the more detailed info) cranksensor should be VR.
Primary trigger
- 3 pins: correct (but that can be either VR or HALL)
- according to our information, crankshaft=VR , connected as primary trigger (traditionally "EC36/27" in VEMS, mot88/pin16 on the M50 Vanos type mainboard)
- please confirm crankshaft=VR.
- motronic88 connector pins: resistance between 16 and 43 (or in engine bay with sensor connector disconnected)
- Preferrably by DVM measurement: if you find 2 pins that measures same resistance in both directions (usually between 300 and 1400 Ohm) that is VR. Otherwise HALL.
Probably wrong info below, saying crankshaft=HALL (info mounting in emails before this page was created)
M50B25TU 141 kW (189 hp) @ 5900 245 N·m (181 lb·ft) @ 4200 6500 84 mm (3.3 in) 75 mm (3.0 in) 10.5 1993
M50B256S2
Single Vanos
3 PIN Hallsensor Crankshaft (editors note: 3 pin is correct, but "HALL" must be wrong)
we are sure - Motorcode M50 S256S2, with single Vanos - Hallsensor Crankshaft with 3 pins (editors note: 3 pin is correct, but "HALL" must be wrong)
The partsnumber of the original ECU is Bosch 0 261 200 413
Identifikationnumber of the BMW is WBACB31060FD7.... (last 4 digits removed)
M50 single vanos is 100% VR crank, Hall cam.
BMW ETM shows the very clear VR and HALL symbols for the sensors.
According to Bentley manual and personal experience, the crank sensor can be HALL or VR on BMW M50 engines.
- For Bosch DME M1.7 Crank:VR, Cam:VR
- For Bosch DME M3.1 Crank:VR, Cam:VR
- For Bosch DME M3.3.1 Crank:VR, Cam:HALL
- For Bosch DME M5.2 Crank:VR, Cam:HALL
- For Siemens MS 41.1 Crank:HALL, CAM: sort of VR
- This latest Siemens CAM sensor however is far from standard, cannot be used with aftermarket ECUs